Screw cap



Patented Jan. s, 1931 UNITED STATES PATENT oFFlc-E EDGAR SCOFIELD, F YORK, N. Y., .ASSIGNOR TO ANCHOR CAP GLOSURE COR- PORATION, OF NEW YORK, N. Y.,

A CORPORATION OF N EW 'YORK SCREW OAI Application mea December 1s, 19a?" serial no. 240,999.

- for glass containers and the like.`

It is customary to provide closure caps with liners which extend over the mouth of containers to protect the inside of the cap from the contents and to form a proper seal on the edge of'the container. Such liners may be made of paper, cardboard, or other suitable material which may be waxed as an entirety or formed with a thin sheet of waxed paper on the lower side thereof. Hereto fore liners have been secured in place by adhesives or have itted loosely in the top portion of the cap; the inwardly extending parts of the threads of screw caps are relied upon to prevent their falling out. In such constructions the liners do not lit properly against the cover of the cap, and man of them become dislodged in shipment and ave to be replaced in the caps manually by inexperienced operators employed b packers, thereby causing considerable trou le.

Continuous thread caps have a tendency to adhere to the threads of a container, and rust sometimes renders them ve diicult to remove. Consumers generally oosen such caps by tapping in some way, usually at the upper periphery of the cap. This subjects the edge of the glass container to the blows, hence the contents of the packages are frequently ruinedV by broken glass in the removal of the caps. The same diiiiculty is experienced in the'accidental contact of the upper part of the .containers with extraneous o jects in shipment or in handling. If the upper edge of the container is chipped the contents must be thrown away because broken glass is extremely dangerous.

The present invention overcomes or minimizes these diiculties by providing a cap in which the liner fits snugly in the upper part against the cover of the cap and is prevented from falling out of the cap durin shipment. In addition, the construction of t e cap and liner is such that the upper edge of the container is protected against injury by the tapping incident to the removal of the ca or by accidental contact of this portion of t e container with extraneous objects during handling and shipment. The' construction of the cap is such that the effectiveness of tapping for loosening the cap is very materially increased.

An object of the inventlon is to provide an inexpensive closure cap which will protect the upper edge of the container lfrom injury.

Another object of the invention is to prevent accidental removal of liners from closue caps occasioned by handling incident to packing for shipment and for application to filled containers.

Another object of the invention is to retain the liners against the cover portion of the caps atall times.

A further object of the invention is to provide a'liner adapted to extend over the outer edge of the mouth of the receptacle and upon deformation of the up er periphery of the cap to envelop about t e outer edge of the container to prevent injury thereto.

Other and further objectsof the invention will be obvious upon an understandin of the @for purposes of illustration and description and is-shown in the accompanying drawings, wherein v Fig. 1 is an elevational view of a screw cap enbodying the present invention;

Fig. 2 is a sectional view ofthe cap with liner therein;

Fig. 3is a sectional view of the cap applied to a container;

Fig. 4 is an enlarged fragmentary sectional view ofaport-in of the cap;

Fig. 5 is an enlarged sectional view on the line 5-5 of Fig. 4; and A Fig. 6 is an enlarged sectional view of a portion of the cap and container illustrating, in dotted lines, the effect of tapping the upper edge of the cap.

Referring to the drawings, there is shown -a closure cap having a cover portion 1 and a depending skirt 2 provided with continuous screw threads 4 in the body thereof and with the lower edge rolled as shown at 5 to reinforce this portion of the cap and to prevent contact with the raw edge of the metal. The cover portion may have a groove 6. for purposes of ornamentation. At the upper part of the skirt of the cap there is an annular zone 7 which forms an acute angle with the cover portion of the cap. The minimum diameter of the zone 2 is at the lower part thereof and preferably this diameter is substantially equal to or slightly less than the `minimum internal diameter of the cap. A

suitable liner 8 is applied to the cap either manually or by suitable machinery and is sufficiently largel to fit snugly in the apex 9 of the acute angle formed by the cover and shape of the corrugated zone.

skirt of the cap. A The liner may and preferably does comprise a thick part 10 covered by a thin sheet of waxed material 11 on the lower side there- V1v of. The inwardly extending part of the zone 7.(holds the liner snugly against the cover .portion of the cap land presses the sheet of 25.; thin material 11 firmly against the liner, thereby preventing accidental removal thereof. The annular zone 7 at the upper part of the cap is preferably corrugated "as shown at 12 to facilitate gripping ofthe cap and in addition to provide a better engagement with the liner. The outer edge of the liner is suliiciently pliable to conform to the l In thisway a better lit is attained.

It will be noted that the corner formed b the junction of the cover portion and the s irt of the ca is relatively sharp and j spaced slightly rom the upper edge of the jar 1.4 when applied thereto. The liner 8 1s slightly larger than the mouth of the container. When the corner, formed by the junction of the cover portion and skirt, is tapped either accidentally or for the purpose of removing the cap, the outer edge of the liner is bent downwardly about the edge of the container as shown in dotted lines in Fig. 5. The fibrous liner cushions the blows an prevents injury to the container. The depression of the corner as shown in dotted lines in Fig. 5 causes a corresponding displacement downward of the skirt ofthe cap which loosens it about the threads on the cffmtainer and permits ready removal thereo It will be seen that the present invention provides an inexpensive closure `cap with the linernsecurely held in position without the use l"of adhesives between the upper part thereof and the cover portion of the cap. The liner is slightly larger than the external diameter of the mouth of the receptacle and is adapted to nest about the upper edge of the receptacle when the corner between the skirt and cover .portion of the cap is depressed. In this way blows upon the cap to loosen same or accidental blows encountered `in shipment and handling, are cushioned and injury to the u per edge of the container is prevented. he invention is readily applicable to the present forms of closures without substantial change to existing machines for manufacturing caps. Displacement of liners during shipment and handling is minimized if not entirely eliminated. The cap forms with a container a ackage which is rugged in construction and Ifully capable of withstanding the rough usage encountered in handling and shipping.

As various changes may be made in the above embodiment without departing from the spirit of the invention, it is to be understood that all matter herein is to be interpreted as illustrative and noty in a limiting sense. Y

Having thus described my invention, I claim:

1. A screw cap comprising a cover portion, a dependin skirt having an annular, inwardly extending. knurled portion forming an acute angle with the cover portion of the cap and extending downwardly a distance substantially greater than the thickness of the liner, 'a cardboard liner pressed into the cap andfitting snugly in the apex of said angle and resting up'on said inturned annular knurled portion, whereby the reduced portion of the skirt adjacent the bottom ofthe knurled inturned ortionholds said liner in said cap, a rolle edge on the bottom of the skirt of the cap, and thread engaging means on the skirt of said cap below said inturned knurled annular portion;

2. A screw-cap comprising a cover portion, a dependin skirt having an annular inwardly exten in acute angle -with t e cover portion of the cap and extending 'downwardly from the cover part of the cap a distance substantially reater than the thickness of the liner, a card oard liner fitting snugly in the apex of said angle and restin upon said inturned annular portion where y the reduced poi'- tion of the skirt adjacent the bottom of the annular inturned portion holds said liner in position in said cap, a rolled edge on the bottom of the skirt -of the cap, and a continuous thread extending about said cap directly adjacent said rolled edge and intermediate sald rolled ed'ge and said inturned portion.

3. A screw cap comprising a cover portion, a depending skirt having a rolled edge at the bottom thereof, and a continuous screw thread extending down to the rolled edge, the junction of said skirt and said cover portion forming substantially an acute angle with corrugations extending vertically thereof, the size of the upper part of the skirt being larger than the mouth lof the container permit the upper part of the skirt to be attened to loosen the cap, and

y -a cardboard liner adapted to be pressed into the recess formed at the 'unction of the skirt and cover portion, the epth of said recess being substantially greater than the thickness of the liner to hold said liner in position.

4. A screw closure cap comprising a cover portion, a depending skirt, said skirt having an inturned annular corrugated zone at the upper part thereofv forming an acute angle with the cover portion and spacin the periphery of the cover portion a su stantial distance from the rim'of the container when ap lied thereto and permitting a disc liner to be inserted therein, a liner in said capjlitting snugly in the apex of said acute angle and held in position thereby, and thread engagingl means on the skirt of saidcap adapted to engage pro]ections on a container to hold the cap in position.

5. A screw closurecapcomprisinga cover portion, a depending skirt, saidv skirt having an inturned annular corrugated zone at the p upper'part thereof forming an ac ute angle with the cover portion 4of the cap, a disc liner pressed into said cap and fitting into the apex of said acute angle, said liner being held 1n position by said inturned annular corrugated portion, a rolled edge on the bottom riphery of the cover portion may be flattened to loosen the cap on the container, a disc liner seated in said cap, a rolled edge at the bottom of the skirt, and screw threads in ltermediate the corrugations and the rolled edge, whereby the screw threads are rein-` s forced' on one side by the abutting rolled edge .5o

and on the other side by the abutting in tnrned corrugated zone.

7. A screw cap comprising a cover portion, a depending skirt having an inwardly extendsaid corrugations, said thread occupying the entire space between the corrugations an the rolled edge.

8. A screw closure cap comprising a cover portion, a depending skirt having a rolled edge at the bottom thereof and a continuous Screw thread extending down to the rolled edge, the junction of sald skirt and said 'cover portion forming substantially an acute angle with corrugations extending vertically thereof, the size of the upper part of the skirt being larger than the mouth of the container, to permit the upper part of the skirt to be attened to loosen the cap, and a liner adapted to be pressed into the recess formed by the junction of the skirt and cover portion to prevent removal thereof, said liner fitting over the outer edge of the receptacle to envelop and protect said edge when the corrugated annular portion is flattened to remove the cap. Dated: New York, N. Y., November 22,

EDGAR SCOFIELD.

` ing knurled or corrugated portion forming an acute an le with the cover portion of the cap, a liner aving a sheet of thm material on the lower s ide thereof, said liner fitting snugin the apex of said angle and resting upon the corrugations whereby the reduced portion ofthe skirt adjacent the bottom of the corrugations holds said liner and said sheet rm- 1yl in osition, a rolled edge on the bottom of said s irt and a continuous thread extending about said cap directly adjacent said rolled edge and intermediate said rolled edge and 

